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run code in 200+ php & hhvm versions
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<?php echo json_encode([ 'user_info' => '{"user_info":{"uid":1252206,"token":"testtoken","channel":"ttzww","username":"testuserA","avatar":"http:\/\/www.baidu.com"}}']);
based on EZQKA
Output for 5.6.0 - 5.6.30, hhvm-3.18.5 - 3.22.0, 7.0.0 - 7.3.0beta1
{"user_info":"{\"user_info\":{\"uid\":1252206,\"token\":\"testtoken\",\"channel\":\"ttzww\",\"username\":\"testuserA\",\"avatar\":\"http:\\\/\\\/www.baidu.com\"}}"}